EXPERIENCE WITH THE 0.05 MICRON ABSOLUTE RATED FILTERS IN THE CVCS SYSTEM OF A PWR PLANT


11th International Conference on CANDU® Maintenance and Nuclear Components - 2017 Oct. 01-04

Presented at:
11th International Conference on CANDU® Maintenance and Nuclear Components
2017 Oct. 01-04
Location:
Toronto, ON Canada
Session Title:
OPEX

Authors:
K. Farooq (Pall Corp.)
W. Walker (Pall Canada Ltd.)
  

Abstract

The use of finer, sub-micron absolute rated filters has been an effective, proven tool for the reduction of out-of-core radiation levels through the control of the corrosion and erosion product transport in PWR systems. Left unchecked, these out-of-core particles are transported to the core thereby become activated and is transported to out of core piping, thus becoming the source term for almost all dose rates in the plant.
A PWR station in the US that was already using absolute rated sub-micron filters was interested in even finer grade filters to reduce occupational exposure through enhanced source term reduction. Until recently, the finest absolute rated filtration available in the industry was 0.1 micron rated at Beta 5000 removal efficiency. Pall recently 0.05 micron absolute rated filters that were installed at the power plant in its CVCS Letdown System Post Demineralizer side. The paper discusses the experience of the plant with the 0.05 micron absolute rated filters.

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